<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>

        span{
            width: 100px;
            height: 100px;
            background-color: yellow;
            position: absolute;
            /* float: left; */
            /* display: block; */
        }
        /*position: absolute; 行内元素转块元素 display：block float：left  */

    </style>
</head>
<body>
    
    <span>123123</span>
</body>
</html>